/***
**兼容Object.keys 不支持情况iang
**/
if (!Object.keys) Object.keys = function(o) {
	if (o !== Object(o))
		throw new TypeError('Object.keys called on a non-object');
	var k=[],p;
	for (p in o) if (Object.prototype.hasOwnProperty.call(o,p)) k.push(p);
	return k;
}